var xmlHttp

function showUser(str,str2)
{ 
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 }
var url="phpajax_log.php"
url=url+"?q="+str
url=url+"?s="+str2
url=url+"&sid="+Math.random()
xmlHttp.onreadystatechange=stateChanged 
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 var temp = xmlHttp.responseText
 var mysplit = temp.split(",");
 if(temp == 1){
   showDialog('Error','Este usuario NO existe en el sistema!','error',3);
 }
 if(temp == 2){
   showDialog('Warning','La contraseņa digitada NO coincide con el usuario!','warning',3);
 }
 
 } 
}
function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 //Internet Explorer
 try
  {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
  }
 catch (e)
  {
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
 }
return xmlHttp;
}